Setting The Operating Temperature - Thermo Scientific 3110 Operating And Maintenance Manual

Section 1
Installation and Start-Up
Setting the Operating
Temperature
Setting the Overtemp
1-14 Water Jacketed CO Incubator
2
Models 3110/3111 have an operating temperature (setpoint) range of 10
to 55°C, Models 3120/3121 at 10 to 50°C, and Models 3130/3131,
3140/3141 at 10 to 45°C. The incubator can only accurately control
temperature as low as +5C above ambient unless it has been installed with
the cooling coil option at the factory which allows the incubator to run at
lower temperatures. See Cooling Coil, Section 6. The incubator is shipped
from the factory with a temperature setpoint of 10°C. At this setting, all
heaters and alarms are turned off.
To change the operating temperature setpoint:
1. Press the Mode key until the Set indicator lights.
2. Press the right arrow until TEMP XX.XC is displayed in the message
center.
3. Press the up/down arrow until the desired temperature setpoint is
displayed.
4. Press Enter to save the setpoint.
5. Press the Mode key until the Run Indicator lights to go to Run mode
or right/left to go to next/previous parameter.
Caution In the event that the heaters are locked on as a result of a failure
in the main temperature control, the independent overtemp circuit is
Setpoint
designed as a safety to protect the incubator only. It is not intended to
protect or limit the maximum temperature of the cell cultures or
customer's equipment inside the incubator if an overtemp condition
occurs.
s
The incubator is equipped with an independent circuit that monitors the
air temperature in the cabinet. Should the main temperature control fail,
the overtemp circuit will disconnect power to all heaters when the chamber
temperature reaches the Overtemp setpoint. When the chamber
temperature falls below the Overtemp setpoint, the overtemp circuit will
reconnect power to all heaters. An incubator operating in the overtemp
condition will maintain the chamber temperature approximately 1°C
around the Overtemp setpoint.
The factory setting for the Overtemp is 40°C. It can be set over a range of
temp setpoint +0.5°C to 60°C. If the temperature setpoint is moved above
the Overtemp setpoint, the Overtemp will automatically update to 1.0°C +
the temp setpoint. It is recommended that the Overtemp setpoint be 1°C
over the temp setpoint.
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